page 19: 11. The Suttavibhanga, the first book of the Vinaya Piþaka, contains in its two partsthe 227 rules for bhikkhus and the rules for bhikkhunìs, who have received the admission(upasampadā), together with accounts of the incidents that led to the announcement ofthe rules, the modification of the rules and the explanations of them. The bare rulesthemselves form the Pātimokkha for bhikkhus and that for bhikkhunìs. They are alsoknown as the “two codes” (dve mātikā). The Pātimokkha is recited by bhikkhus on theUposatha days of the full moon and new moon.

The term "mātikā" (summary, list) seems to have been used first to refer to the bare list of rules in the bhikkhu-pātimokkha and bhikkhuni-pātimokkha. There appear to have been monks and nuns who specialized in memorizing and reciting them. Then there were the detailed explanations and elaborations of those lists, called the sutta-vibhanga ("sutta" also had a somewhat different meaning than what we understand by it today, it meant something like "rule"). Only later on, as the Abhidhamma was gradually developed along similar lines, "mātikā" also refers to the various lists of dhammas enumerated therein.